|Experimental investigation of the ablation of bodies by hypersonic flow - Zotikov, I. A|
No Abstract Available
Keywords: ELECTRICAL MEASUREMENT; HIGH VOLTAGES; VOLTMETERS; LOSSLESS EQUIPMENT
|On non-spherical surfaces in optical instruments - Gullstrand, A|
No Abstract Available
Keywords: CATALYSTS; ELECTRIC POTENTIAL; ELECTRICAL MEASUREMENT; ELECTROLYTES
|Device for preventing high voltage arcing in electron beam welding Patent - Hanchey, K. K.|
Development of device to prevent high voltage arcing in electron beam welding
Keywords: CAPACITANCE; PANELS; SOLAR CELLS; DIFFUSION COEFFICIENT; ELECTRICAL MEASUREMENT; LOADS (FORCES)
Downloads: 146 (1 review)
|Apollo 15 X-ray fluorescence experiment - Adler, I.|
The X-ray fluorescence spectrometer, carried in the SIM bay of the command service module was employed principally for compositional mapping of the lunar surface while in lunar orbit, and secondarily, for X-ray astronomical observations during the trans-earth coast. The lunar surface measurements involved observations of the intensity and characteristics energy distribution of the secondary or fluorescent X-rays produced by the interaction of solar X-rays with the lunar surface...
Keywords: DIELECTRIC PROPERTIES; ELECTRICAL MEASUREMENT; REMOTE SENSORS; AIR; MICROWAVE RADIOMETERS; WAVEGUIDES
|Brazing alloy Patent - Smith, D|
Brazing alloy adapted for brazing corrosion resistant steel to refractory metals, also for brazing refractory metals to other refractory metals
Keywords: ELECTRIC CONNECTORS; ELECTRIC CURRENT; ELECTRICAL MEASUREMENT; STRAIN GAGES
|Oxygen difluoride research study Final report, Jun. 1963 - Sep. 1965 - Jackson, R. B|
Ammonia decontaminant control of oxygen difluoride and static and dynamic compatibility tests with plastic and elastomer materials
Keywords: ELECTRICAL MEASUREMENT; HALL EFFECT; HALL GENERATORS; ELECTRICAL RESISTIVITY; TEMPERATURE COMPENSATION
|Supplement to our communication on formaldehyde and formate formation - Euler, A.|
Chemical analysis of formate and sugar formation from formaldehyde solutions
Keywords: ACIDS; OSCILLOGRAPHS; SOLUTIONS; ALKALIES; CATHODES; ELECTRIC POTENTIAL; ELECTRICAL MEASUREMENT; IRON; NICKEL; CAPACITANCE; ELECTRIC CURRENT
|Urban and regional land use analysis: CARETS and Census Cities experiment package - NON|
The author has identified the following significant results. The arrival of the so-called energy crisis makes the portion of this experiment dealing with land use climatology of more immediate significance than before, since in addition to helping to understand the processes of climatic change associated with urbanization, the knowledge obtained may be useful in assigning an energy balance impact factor to proposed changes in land use in and around cities...
Keywords: CHARGE CARRIERS; SEMICONDUCTORS (MATERIALS); DIELECTRIC PROPERTIES; ELECTRICAL MEASUREMENT; MODULATION; SPACE CHARGE
|Aerodynamic Database Development for Mars Smart Lander Vehicle Configurations - Bobskill, Glenn J.|
An aerodynamic database has been generated for the Mars Smart Lander Shelf-All configuration using computational fluid dynamics (CFD) simulations. Three different CFD codes, USM3D and FELISA, based on unstructured grid technology and LAURA, an established and validated structured CFD code, were used. As part of this database development, the results for the Mars continuum were validated with experimental data and comparisons made where applicable...
Keywords: POLYETHYLENES; ELECTRICAL MEASUREMENT; ELECTRICAL RESISTIVITY; FIELD EFFECT TRANSISTORS; SUBSTRATES; SILICON DIOXIDE; DEPOSITION
|Atlantic tropical cyclone strike probabilities (for selected stations and the month of September) - Crutcher, H. L|
Atlantic tropical cyclone strike probabilities for selected stations during September
Keywords: PERFORMANCE TESTS; THERMIONIC CONVERTERS; URANIUM OXIDES; ELECTRICAL MEASUREMENT; NUCLEAR FUELS; SERVICE LIFE; THERMIONIC EMISSION; WORK FUNCTIONS
|Evaluation of the silver tarnish problem, launch processing system - Welch, Peter J|
No Abstract Available
Keywords: ELECTRIC FIELDS; ELECTRICAL MEASUREMENT; GROUND EFFECT (COMMUNICATIONS); LIGHTNING; RADIO DIRECTION FINDERS; DIRECTION FINDING; DISTANCE; SUMMER; THUNDERSTORMS
|AERODYNAMICS AND FLIGHT DYNAMICS OF TURBOJET AIRCRAFT - LIGUM, T. I|
AERODYNAMICS AND FLIGHT DYNAMICS OF TURBOJET AIRCRAFT
Keywords: ELECTRIC ARCS; ELECTRICAL RESISTIVITY; HIGH TEMPERATURE AIR; THERMAL CONDUCTIVITY; THERMAL PLASMAS; ELECTRICAL MEASUREMENT; NITROGEN; TEMPERATURE MEASUREMENT
Downloads: 5,442 (3 reviews)
|Euler/Navier-Stokes flow computations on flexible configurations for stability analysis - Guruswamy, G.|
Longitudinal dynamic stability derivatives required for design of aircraft are computed by using the state-of-the-art numerical methods for wing-body configurations. The flow is modeled using the Euler/Navier-Stokes equations with turbulence models and solved using an efficient finite-difference scheme suitable for patched structured grids. Computations are made at a flow regime that is beyond the limits of the current linear methods mostly used for computing stability derivatives...
Keywords: ALUMINUM; COATINGS; ELECTRICAL MEASUREMENT; METAL FILMS; THIN FILMS; METAL STRIPS; ELECTRICAL RESISTANCE; ELECTROMIGRATION; CURRENT DENSITY; MICROSTRUCTURE; SILICON OXIDES
|Evolution of Tropical and Extratropical Precipitation Anomalies During the 1997 to 1999 ENSO Cycle - Curtis, Scott|
The 1997-1999 ENSO period was very powerful, but also well observed. Multiple satellite rainfall estimates combined with gauge observations allow for a quantitative analysis of precipitation anomalies in the tropics and elsewhere accompanying the 1997-99 ENSO cycle. An examination of the evolution of the El Nino and accompanying precipitation anomalies revealed that a dry Maritime Continent preceded the formation of positive SST anomalies in the eastern Pacific Ocean...
Keywords: STIRLING CYCLE; ELECTRICAL MEASUREMENT; FINITE ELEMENT METHOD; LINEAR ALTERNATORS; PERMANENT MAGNETS; OPEN CIRCUIT VOLTAGE; TECHNOLOGY UTILIZATION; MAGNETIC FLUX; LOADS (FORCES)
|Natural oscillations of a gas flowing about a lattice of plates - Kurzin, V. B|
Natural oscillations of gas flow about lattice of plates
Keywords: CLOUD PHYSICS; ELECTRIC POTENTIAL; FLIGHT SAFETY; LIGHTNING; ROCKET FLIGHT; ELECTRIC DISCHARGES; ELECTRIC FIELD STRENGTH; ELECTRICAL MEASUREMENT; RESEARCH PROJECTS
|CHRONIC POTASSIUM DEFICIENCY AND EXCITABILITY OF MUSCLE CELLS. MEASUREMENTS WITH INDIVIDUAL HUMAN MUSCLE CELLS IN SITU - BOLTE, H.|
A RESTING MEMBRANE POTENTIAL OF -99.6 MV, A THRESHOLD CURRENT OF 4.37 X 10 TO THE -8TH POWER A, AND A LATENCY TIME OF 27.2 MSEC. WAS FOUND IN PATIENTS WITH CHRONIC POTASSIUM DEFICIENCIES OF VARIOUS ORIGINS. IN COMPARISON TO CONTROLS IN HEALTHY PERSONS, THE RESTING MEMBRANE POTENTIAL WAS INCREASED BY 16.0 MV. THE THRESHOLD CURRENT DID NOT SHOW A STATISTICALLY SIGNIFICANT CHANGE. THE LATENCY TIME WAS INCREASED BY MORE THAN 100%; I.E., BY 15.3 MSEC...
Keywords: ELECTRICAL RESISTIVITY; ROCKS; THERMODYNAMICS; CONDUCTIVE HEAT TRANSFER; ELECTRICAL MEASUREMENT; HIGH TEMPERATURE; MEASURING INSTRUMENTS; PRESSURE EFFECTS; TEMPERATURE EFFECTS
|Independent Orbiter Assessment (IOA): Assessment of the communication and tracking subsystem, volume 2 - Long, W. C|
The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis (FMEA) and Critical Items List (CIL) are presented. The IOA effort first completed and analysis of the Communication and Tracking hardware, generating draft failure modes and potential critical items. The IOA results were then compared to the NASA FMEA/CIL baseline. A resolution of each discrepancy from the comparison is provided through additional analysis as required...
Keywords: CATHODES; MECHANICAL PROPERTIES; SURVEYS; ELECTRIC BATTERIES; ELECTRICAL RESISTIVITY; LITHIUM; POLYMERIC FILMS; TRANSPORT PROPERTIES; CHEMICAL PROPERTIES; ELECTRIC DISCHARGES; ELECTRICAL MEASUREMENT
|Fuel Line Based Acoustic Flame-Out Detection System - NON|
An acoustic flame-out detection system is described that renders a large high pressure combustor safe in the event of a flame-out and possible explosive re-ignition. A dynamic pressure transducer is placed in the fuel line and detects the stabilizing fuel pressure oscillations caused by the combustion process. An electric circuit converts the signal from the combustion vortices, and transmitted to the fuel flow, to a series of pulses...
Keywords: ELECTRICAL PROPERTIES; ELECTROMAGNETISM; ELECTROMAGNETIC SCATTERING; THREE DIMENSIONAL MODELS; TWO DIMENSIONAL MODELS; ELECTRICAL MEASUREMENT; FINITE ELEMENT METHOD; HIGH TEMPERATURE; COMPOSITE STRUCTURES
|Inter-Satellite Communications Considerations and Requirements for Distributed Spacecraft and Formation Flying Systems - Kwadrat, Carl F.|
In order to avoid selecting inadequate inter-spacecraft cross-link communications standards for Distributed Spacecraft System (DSS) missions, it is first necessary to identify cross-link communications strategies and requirements common to a cross-section of proposed missions. This paper addresses the cross-link communication strategies and requirements derived from a survey of 39 DSS mission descriptions that are projected for potential launch within the next 20 years...
Keywords: CAPACITORS; ELECTRIC BATTERIES; SPACECRAFT POWER SUPPLIES; ELECTRIC ENERGY STORAGE; COMPUTERIZED SIMULATION; MATHEMATICAL MODELS; ELECTRICAL MEASUREMENT; AEROSPACE VEHICLES; EQUIVALENT CIRCUITS
|Control algorithms for aerobraking in the Martian atmosphere - Ward, Donald T.|
The Analytic Predictor Corrector (APC) and Energy Controller (EC) atmospheric guidance concepts were adapted to control an interplanetary vehicle aerobraking in the Martian atmosphere. Changes are made to the APC to improve its robustness to density variations. These changes include adaptation of a new exit phase algorithm, an adaptive transition velocity to initiate the exit phase, refinement of the reference dynamic pressure calculation and two improved density estimation techniques...
Keywords: BIPOLAR TRANSISTORS; FIELD EFFECT TRANSISTORS; METAL OXIDE SEMICONDUCTORS; SILICON; SWITCHING CIRCUITS; VOLTAGE CONVERTERS (DC TO DC); ELECTRICAL MEASUREMENT; INVERTERS; SWITCHING
|Progress in Search for Antihelium with BESS - Sasaki, M.|
We have searched for antihelium nuclei in cosmic rays using the data obtained from balloon flights of the BESS magnetic spectrometer. The search was mainly based on track-quality selection, followed by rigidity analysis, and on the time-of-flight and dE/dx measurements by the scintillation counter hodoscope. We analysed all the data collected during 1993-2000 with a common analysis procedure. No antihelium nuclei events were found in the energy range from 1 to 14 GV...
Keywords: FREE ENERGY; OXIDATION-REDUCTION REACTIONS; ELECTRICAL MEASUREMENT; ELECTRIC CURRENT; CYCLIC HYDROCARBONS; CHEMICAL REACTIONS; CATIONS; PYRIDINES; ELECTRONS; REDUCTION (CHEMISTRY); BENZENE; CARBONYL COMPOUNDS; LINEARITY; NITROGEN DIOXIDE
|Possible funding strategies - Davidson, T. F|
Funding strategies are examined for the AIA rocket propulsion strategic plan. Either the government, industry, or universities can fund the project alone, or it was concluded, it works best if is a combination of these sources.
Keywords: CAPACITANCE; DIRECT CURRENT; ELECTRIC CURRENT; ELECTRICAL MEASUREMENT; LEAKAGE; CAPACITORS; DIELECTRIC PROPERTIES; GLASS; HIGH TEMPERATURE; TANTALUM; TEFLON (TRADEMARK); TEMPERATURE EFFECTS; AEROSPACE ENVIRONMENTS
|Numerical Modeling Studies of Wake Vortex Transport and Evolution Within the Planetary Boundary Layer - Lin, Yuh-Lang|
In support of the wake vortex effect of the Terminal Area Productivity program, we have put forward four tasks to be accomplished in our proposal. The first task is validation of two-dimensional wake vortex-turbulence interaction. The second task is investigation of three-dimensional interaction between wake vortices and atmospheric boundary layer (ABL) turbulence. The third task is ABL studies. The, fourth task is addition of a Klemp-Durran condition at the top boundary for TASS model...
Keywords: CADMIUM TELLURIDES; X RAY DIFFRACTION; ELECTRICAL MEASUREMENT; PHASE DIAGRAMS; SINGLE CRYSTALS; AMPOULES; SEEDS; ZINC TELLURIDES; TERNARY ALLOYS; CRYSTAL GROWTH; ETCHING; PHOTOLUMINESCENCE; VAPOR PHASES; LOW TEMPERATURE; ATOMIC FORCE MICROSCOPY
|ESTAR Measurements During the Southern Great Plains Experiment (SGP99) - LeVine, D. M.|
During the Southern Great Plains experiment, the synthetic aperture radiometer, ESTAR, mapped L-band brightness temperature over a swath about 50 km wide and about 300 km long extending west from Oklahoma City to El Reno and north from the Little Washita River watershed to the Kansas border. ESTAR flew on the NASA P-3B Orion aircraft at an altitude of 7.6 km and maps were made on 7 days between July 8-20, 1999...
Keywords: CONSTRUCTION; CONTAMINATION; ELECTRICAL MEASUREMENT; LIFE (DURABILITY); MICROMETEOROIDS; OXYGEN ATOMS; SERVICE MODULES; SPACE STATION STRUCTURES; CONTAMINANTS; DEGRADATION; DEPLOYMENT; RADIATION DAMAGE; SOLAR ARRAYS; ADHESIVE BONDING; COATING
|HEALTH AND SAFETY: PRELIMINARY COMPARATIVE ASSESSMENT OF THE SATELLITE POWER SYSTEM (SPS) AND OTHER ENERGY ALTERNATIVES - HABEGGER, L. J.|
DATA READILY AVAILABLE FROM THE LITERATURE WERE USED TO MAKE AN INITIAL COMPARISON OF THE HEALTH AND SAFETY RISKS OF A FISSION POWER SYSTEM WITH FUEL REPROCESSING; A COMBINED-CYCLE COAL POWER SYSTEM WITH A LOW-BTU GASIFIER AND OPEN-CYCLE GAS TURBINE; A CENTRAL-STATION, TERRESTRIAL, SOLAR PHOTOVOLTAIC POWER SYSTEM; THE SATELLITE POWER SYSTEM; AND A FIRST-GENERATION FUSION SYSTEM. THE ASSESSMENT APPROACH CONSISTS OF THE IDENTIFICATION OF HEALTH AND SAFETY ISSUES IN EACH PHASE OF THE ENERGY CYCLE F...
Keywords: BABBITT METAL; ELECTRICAL RESISTANCE; FAILURE MODES; FLUX DENSITY; SPACECRAFT POWER SUPPLIES; CAPACITORS; ELECTRIC CONTACTS; METALLIZING; POLYVINYL FLUORIDE; POWER CONVERTERS; ACCELERATED LIFE TESTS; CAPACITANCE; ELECTRICAL MEASUREMENT
|Some comparisons of US and USSR aircraft design developments - Spearman, M. L|
A review is given of the design and development of some US and USSR aircraft. The emphasis is on the historical development of large aircraft-civil and military transports and bombers. Design trends are somewhat similar for the two countries and indications are that some fundamental characteristics are dictated more by ideological differences rather than technological differences. A brief description is given in a more or less chronological order of the major bomber aircraft, major civil and mil...
Keywords: ABSORPTANCE; SEMICONDUCTORS (MATERIALS); SOLAR CELLS; SOLAR GENERATORS; TEMPERATURE EFFECTS; ULTRAVIOLET RADIATION; CORROSION; DESORPTION; ELECTRICAL MEASUREMENT; HUMIDITY; ION IMPLANTATION; PHOTOVOLTAIC EFFECT; POTTING COMPOUNDS; RADIATION EFFECTS
|Modeling and Simulation of Shuttle Launch and Range Operations - Bardina, Jorge|
The simulation and modeling test bed is based on a mockup of a space flight operations control suitable to experiment physical, procedural, software, hardware and psychological aspects of space flight operations. The test bed consists of a weather expert system to advise on the effect of weather to the launch operations. It also simulates toxic gas dispersion model, impact of human health risk, debris dispersion model in 3D visualization...
Keywords: HOLLOW CATHODES; LASER BEAMS; VELOCITY DISTRIBUTION; EROSION; ION ENGINES; LASER INDUCED FLUORESCENCE; ELECTRIC PROPULSION; ELECTRIC DISCHARGES; XENON; ELECTRICAL MEASUREMENT; DENSITY MEASUREMENT
|Grains in galactic haloes - Ferrara, Andrea|
Researchers considered the effect of extensive forces on dust grains subjected to the light and matter distribution of a spiral galaxy (Greenberg et al. (1987), Ferrini et al. (1987), Barsella et al (1988). Researchers showed that the combined force on a small particle located above the plane of a galactic disk may be either attractive or repulsive depending on a variety of parameters. They found, for example, that graphite grains from 20 nm to 250 nm radius are expelled from a typical galaxy, w...
Keywords: ATMOSPHERIC ELECTRICITY; ELECTRICAL MEASUREMENT; PRELAUNCH PROBLEMS; SPACECRAFT LAUNCHING; TEST VEHICLES; THUNDERSTORMS; WEATHER FORECASTING; ATMOSPHERIC SOUNDING; CAPE KENNEDY LAUNCH COMPLEX; CLOUDS (METEOROLOGY); DATA ACQUISITION; ELECTRIC FIELDS; LIGHTNING; METEOROLOGICAL PARAMETERS; AIRBORNE EQUIPMENT
|Passive Fetal Heart Monitoring System - NON|
A fetal heart monitoring system and method for detecting and processing acoustic fetal heart signals transmitted by different signal transmission modes. One signal transmission mode, the direct contact mode, occurs in a first frequency band when the fetus is in direct contact with the maternal abdominal wall. Another signal transmission mode, the fluid propagation mode, occurs in a second frequency band when the fetus is in a recessed position with no direct contact with the maternal abdominal w...
Keywords: FERROELECTRICITY; CAPACITORS; TRANSISTORS; SCANNING ELECTRON MICROSCOPY; HIGH TEMPERATURE TESTS; TRAVELING IONOSPHERIC DISTURBANCES; RANDOM ACCESS MEMORY; RADIATION EFFECTS; RADIATION DOSAGE; IONIZING RADIATION; RADIATION TOLERANCE; MICROELECTRONICS; ACCELERATED LIFE TESTS; ELECTRICAL MEASUREMENT
|Vertical distribution of clouds over Hampton, Virginia observed by lidar under the ECLIPS and FIRE ETO programs - Vaughan, M. A.|
Intensive cloud lidar observations have been made by NASA Langley Research Center during the two observation phases of the ECLIPS project. Less intensive but longer term observations have been conducted as part of the FIRE extended time observation (ETO) program since 1987. We present a preliminary analysis of the vertical distribution of clouds based on these observations. A mean cirrus thickness of just under 1 km has been observed with a mean altitude of about 80 percent of the tropopause hei...
Keywords: ZINC SELENIDES; MICROGRAVITY; SURFACE PROPERTIES; ELECTRICAL MEASUREMENT; RESEARCH AND DEVELOPMENT; NASA PROGRAMS; UNIVERSITY PROGRAM; VAPOR DEPOSITION; HEAT TREATMENT; IMPURITIES; SINGLE CRYSTALS; CRYSTAL GROWTH; GRAVITATIONAL EFFECTS; PHOTOLUMINESCENCE; COPPER; ELECTRICAL RESISTIVITY; CAPACITANCE; OPTOELECTRONIC DEVICES
|Solar Flare Physics - Schmahl, Edward J.|
We have continued our previous efforts in studies of fourier imaging methods applied to hard X-ray flares. We have performed physical and theoretical analysis of rotating collimator grids submitted to GSFC for future space or suborbital missions involving the imaging of solar flares in hard X-rays. In particular, we have simulated the performance of the High Energy Solar Spectroscopic Imager (HESSI), using pseudo-flare images provided...
Keywords: CARRIER DENSITY (SOLID STATE); WAVE DISPERSION; NARROWBAND; NONLINEARITY; SOLID STATE DEVICES; FREE ELECTRONS; EPITAXY; ELECTRON DENSITY (CONCENTRATION); CHARGE CARRIERS; ELECTRON MASS; ZINC COMPOUNDS; MERCURY CADMIUM TELLURIDES; OPTICAL MEASUREMENT; ELECTRICAL MEASUREMENT; CONDUCTION BANDS; INFRARED DETECTORS; STATISTICAL DISTRIBUTIONS
|BSTJ 7: 1. January 1928: Electrical Measurement of Communication Apparatus. (Shackelton, W.J.; Ferguson, J.G.)|
Bell System Technical Journal, 7: 1. January 1928 pp 70-89. Electrical Measurement of Communication Apparatus. (Shackelton, W.J.; Ferguson, J.G.)
Keywords: frequency; resistance; capacitance; inductance; measurement; circuit; impedance; bridge; measuring; condenser; direct current; bridge circuit; electrical measurement; phase angle; system technical; impedance bridge; high degree; technical journal; bell system; standard attenuator
|High Accuracy Evaluation of the Finite Fourier Transform Using Sampled Data - Morelli, Eugene A|
Many system identification and signal processing procedures can be done advantageously in the frequency domain. A required preliminary step for this approach is the transformation of sampled time domain data into the frequency domain. The analytical tool used for this transformation is the finite Fourier transform. Inaccuracy in the transformation can degrade system identification and signal processing results...
Keywords: STRAIN MEASUREMENT; LAMINAR BOUNDARY LAYER; F-16 AIRCRAFT; SHIPS; COMPARISON; POWER CONDITIONING; ERRORS; STRAIN GAGES; WHEATSTONE BRIDGES; ELECTRICAL MEASUREMENT; ELECTRICAL RESISTANCE; SIGNAL PROCESSING; ELECTRIC POTENTIAL; ELECTRIC CURRENT; BOUNDARY LAYER CONTROL
|SPACE RESEARCH IN ARGENTINA (LA INVESTIGACION ESPACIAL EN LA ARGENTINA) - NON|
SPACE RESEARCH IN ARGENTINA, HIGH ALTITUDE BALLOON MEASUREMENTS, ELECTRON MEASUREMENTS, SATELLITE TRACKING, METEOROLOGY, GEODESY, AURORAS, AND RADIO ASTRONOMY
Keywords: AEROSPACE SCIENCES; SATELLITE TRACKING; ARGENTINE SPACE PROGRAM; AURORA; ELECTRIC MEASUREMENT; GEODESY; HIGH ALTITUDE BALLOON PROGRAM; RADIO ASTRONOMY; SATELLITE TRACKING; SPACE SCIENCE; ARGENTINA; AURORAS; BALLOON SOUNDING; ELECTRICAL MEASUREMENT; GEODESY; HIGH ALTITUDE BALLOONS; METEOROLOGY; RADIO ASTRONOMY